CN102721664A - Multiple beam laser induced infrared radiation imaging apparatus and method - Google Patents
Multiple beam laser induced infrared radiation imaging apparatus and method Download PDFInfo
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- CN102721664A CN102721664A CN2012101236188A CN201210123618A CN102721664A CN 102721664 A CN102721664 A CN 102721664A CN 2012101236188 A CN2012101236188 A CN 2012101236188A CN 201210123618 A CN201210123618 A CN 201210123618A CN 102721664 A CN102721664 A CN 102721664A
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Abstract
The invention discloses a multiple beam laser induced infrared radiation imaging apparatus and method. The multiple beam laser induced infrared radiation imaging apparatus comprises a laser, a diffraction spectrometer, a laser beam modulating device, a laser focusing lens, an infrared radiation wave collection device, an infrared filter device and an infrared detector. The invention utilizes a single infrared detector to directly obtain a two-dimensional thermal infrared radiation image; the imaging speed is greatly improved compared with a traditional point-by-point scanning imaging method; and the imaging device has no infrared camera needed in a traditional two-dimensional imaging technique, so as to reduce the complexity of the system and save the cost.
Description
Technical field
The present invention relates to multi-beam laser and induce the infrared radiation imaging field, specifically is a kind of infrared radiation imaging device and method of utilizing the beam split of diffraction light-dividing device.
Background technology
Light-heat radiation survey (Photothermal radiometry) technology is a kind of Dynamic Non-Destruction Measurement of the infrared radiation ripple that under laser radiation, produces of measuring samples.The ultimate principle of optical heat radiation technology is: a branch of laser beam incident through ovennodulation can cause the local temperature variation, thereby cause the variation of the infrared emanation of sample to the surface of sample behind the energy of absorption of sample laser beam.The infrared emanation that causes because of laser radiation is relevant with substance characteristics such as the absorption coefficient of sample, thermal diffusion coefficients, through the infrared emanation signal that the Laser Measurement irradiation causes, can obtain the substance characteristics such as absorption coefficient, thermal diffusion coefficient of sample.
Imaging technique based on the light-heat radiation survey technology has obtained in fields such as Non-Destructive Testing, medical diagnosiss to use widely; Comprise detection, sign, damage and assessment to various composite material defects; The measurement of semiconductor defect, defects in teeth imaging and early-stage cancer detection etc.The light-heat radiation survey technology of existing induced with laser can be divided into two big types.The first kind is to utilize the single-point detector, carries out micro-imaging through point by point scanning, thereby obtains the two dimensional image of sample.The advantage of this method is that every bit all utilizes phaselock technique to detect, and signal to noise ratio (S/N ratio) is good, and detection sensitivity is high, and the resolution of imaging is decided by the excitation laser hot spot, can accomplish higher; Shortcoming is to need point by point scanning, and the labor time, image taking speed is slow.Second type is to utilize infrared detector array (for example infrared camera etc.), directly obtains the two dimensional image of sample.The advantage of this method is that image taking speed is fast; Shortcoming is that imaging resolution depends on infrared detector array and relevant infrared imaging system thereof, compares with the point by point scanning method, and resolution is lower, and sensitivity is also lower, and infrared camera costs an arm and a leg, and volume is big, and is not easy of integration.
Summary of the invention
The technical matters that the present invention will solve provides a kind of infrared radiation imaging device and method of utilizing the beam split of diffraction light-dividing device; Solve long problem consuming time in the point by point scanning optical heat radiation imaging of existing employing Shan Hong external detector; Can overcome also that infrared camera costs an arm and a leg, volume greatly, not easy of integration, and resolution and the lower problem of sensitivity.
Technical scheme of the present invention is:
A kind of multi-beam laser is induced the infrared radiation imaging device; Comprise laser instrument and detector; Described detector is selected infrared eye for use, from being disposed with diffraction light-dividing device, laser beam modulating device, laser focusing lens, infrared radiation ripple gathering-device and infrared filtering device between described laser instrument and the infrared eye.
Described diffraction light-dividing device is selected spectro-grating for use.
Described infrared radiation ripple gathering-device selects for use Infrared Lens or metal to throw the face mirror.
A kind of multi-beam laser is induced the infrared radiation formation method; May further comprise the steps: at first testing sample is placed between laser focusing lens and the infrared radiation ripple gathering-device; The laser beam that sends of laser instrument is divided into the sets of beams that multi beam is array distribution through the diffraction light-dividing device then; Modulated behind the sets of beams process laser beam modulating device; And the modulating frequency of each light beams has nothing in common with each other, and the laser beam group after the modulation shines testing sample after via laser focusing lens, and each Shu Jiguang produces corresponding infrared radiation; Infrared radiation signal by testing sample is collected convergence by the infrared radiation gathering-device, and through getting into infrared eye behind the infrared radiation filter; The laser beam that the infrared radiation signal that infrared eye obtains contains under the different modulating frequency is induced infrared radiation signal; Represent signal respectively from different laser beam The corresponding area on the sample; These signals are handled through follow-up data, and the two-dimensional laser that obtains sample surfaces is induced the infrared radiation image.
Described each Shu Jiguang produces corresponding infrared radiation, and the infrared radiation signal of sample front surface reflection is collected by the infrared radiation gathering-device and assembled, and through getting into the two dimensional image that infrared eye obtains testing sample behind the infrared radiation filter.
Described each Shu Jiguang produces corresponding infrared radiation, and the infrared radiation signal of surperficial outgoing is collected by the infrared radiation gathering-device and assembled behind sample, and through getting into the two dimensional image that infrared eye obtains testing sample behind the infrared radiation filter.
Described infrared eye and a plurality of analog to digital converter or lock-in amplifier carry out parallel measurement, can further save Measuring Time, improve image taking speed.
Design concept of the present invention is:
According to the light path principle of reversibility, in imaging system, replace detection array with array of source, replace pointolite with point probe, promptly the point of each on the array of source is equivalent to a pixel, each point on the corresponding imaging object; Carrier wave through imaging object converges on the point probe through condenser lens; As long as the signal that each point source sends on the array of source is distinguishable; Just can obtain the information of the signal that each point source sends like this with single detector simultaneously, thereby obtain the two-dimensional image information of object.
Advantage of the present invention:
The present invention utilizes the Shan Hong external detector directly to obtain the photo-thermal infrared radiation image of two dimension, and the more traditional point by point scanning formation method of image taking speed improves greatly.The laser that sends with a laser instrument is divided into the sets of beams of 10X10 through the diffraction light-dividing device, excites the infrared radiation wave beam group that produces 10X10 relatively, and image taking speed can improve 100 times in theory like this.And this imaging device need not adopt infrared camera yet as the traditional two-dimensional imaging technique, and this has also reduced the complexity of system, has practiced thrift cost.
Description of drawings
Fig. 1 is the application structure synoptic diagram that multi-beam laser is induced the reflective imaging device of infrared radiation in the embodiment of the invention 1.
Fig. 2 is the application structure synoptic diagram that multi-beam laser is induced infrared radiation transmission formula imaging device in the embodiment of the invention 2.
Embodiment
See Fig. 1; A kind of multi-beam laser is induced the reflective imaging device of infrared radiation, comprises the laser instrument 1, diffraction light-dividing device 2, laser beam modulating device 3, laser focusing lens 4, infrared radiation ripple gathering-device 5, infrared filtering device 6 and the infrared eye 7 that set gradually; Diffraction light-dividing device 2 is selected spectro-grating for use; Infrared radiation ripple gathering-device 5 selects for use Infrared Lens or metal to throw the face mirror; See Fig. 1; A kind of multi-beam laser is induced the infrared radiation formation method; May further comprise the steps: at first testing sample 8 is placed between laser focusing lens 4 and the infrared radiation ripple gathering-device 5; The laser beam that sends of laser instrument 1 is divided into the sets of beams that multi beam is array distribution through diffraction light-dividing device 2 then, and sets of beams is modulated after through laser beam modulating device 3, and the modulating frequency of each light beams has nothing in common with each other; Laser beam group after the modulation shines testing sample 8 after via laser focusing lens 4; Each Shu Jiguang produces corresponding infrared radiation, is collected by infrared radiation gathering-device 5 by the infrared radiation signal of testing sample 8 front surface reflections and assembles, and get into infrared eye 7 through infrared radiation filter 6 backs.The output signal utilization lock phase detection technique of infrared eye 7 is surveyed; At this moment; As the reference signal that lock detects mutually, the infrared radiation signal that has only this beam excitation to produce like this can be measured by lock-in amplifier with the AC signal identical with the modulating frequency of a certain laser beam, and the signal that other laser beam excites is all filtered; Change the frequency of reference signal then successively; Just can obtain the signal that corresponding laser beam excites generation, last again according to the numbering and the corresponding signal that records of laser beam, just can obtain the two dimensional image of the light tight sample in space.In practical application, can utilize a plurality of analog to digital converters or hyperchannel lock-in amplifier to carry out parallel measurement, change the time that reference signal frequency is measured successively, further improve image taking speed to save.The spatial resolution of this formation method is mainly determined by the spot size of sample surfaces exciting light.
Present embodiment is that the infrared signal that is utilized in the radiation of object front surface comes object is carried out to picture.Present embodiment can be used for the defects detection of solid material, and the defects detection of solid material is including, but not limited to the defects detection of semiconductor material and the defects detection of compound substance.The mensuration that also can be used for the physical characteristics of material, physical characteristics is including, but not limited to absorption coefficient, heat-conduction coefficient, microhardness and layer structure parameter etc.This instance also can be used for medical diagnosis, including, but not limited to defects in teeth detection and early-stage cancer diagnosis etc.
See Fig. 2; A kind of multi-beam laser is induced infrared radiation transmission formula imaging device, comprises the laser instrument 1, diffraction light-dividing device 2, laser beam modulating device 3, laser focusing lens 4, infrared radiation ripple gathering-device 5, infrared filtering device 6 and the infrared eye 7 that set gradually; Diffraction light-dividing device 2 is selected spectro-grating for use; Infrared radiation ripple gathering-device 5 selects for use Infrared Lens or metal to throw the face mirror; See Fig. 2; A kind of multi-beam laser is induced the infrared radiation formation method; May further comprise the steps: at first testing sample 8 is placed between laser focusing lens 4 and the infrared radiation ripple gathering-device 5; The laser beam that sends of laser instrument 1 is divided into the sets of beams that multi beam is array distribution through diffraction light-dividing device 2 then, and sets of beams is modulated after through laser beam modulating device 3, and the modulating frequency of each light beams has nothing in common with each other; Laser beam group after the modulation shines testing sample 8 after via laser focusing lens 4; Each Shu Jiguang produces corresponding infrared radiation, is collected by infrared radiation gathering-device 5 through the infrared radiation signal of the testing sample 8 surperficial outgoing in back and assembles, and get into infrared eye 7 through infrared radiation filter 6 backs.The output signal utilization lock phase detection technique of infrared eye 7 is surveyed, and concrete detection process is with embodiment 1.
Claims (6)
1. a multi-beam laser is induced the infrared radiation imaging device; Comprise laser instrument and detector; It is characterized in that: described detector is selected infrared eye for use, from being disposed with diffraction light-dividing device, laser beam modulating device, laser focusing lens, infrared radiation ripple gathering-device and infrared filtering device between described laser instrument and the infrared eye.
2. a kind of multi-beam laser according to claim 1 is induced the infrared radiation imaging device, it is characterized in that: described diffraction light-dividing device is selected spectro-grating for use.
3. a kind of multi-beam laser according to claim 1 is induced the infrared radiation imaging device, it is characterized in that: described infrared radiation ripple gathering-device selects for use Infrared Lens or metal to throw the face mirror.
4. a multi-beam laser is induced the infrared radiation formation method; It is characterized in that: may further comprise the steps: at first testing sample is placed between laser focusing lens and the infrared radiation ripple gathering-device; The laser beam that sends of laser instrument is divided into the sets of beams that multi beam is array distribution through the diffraction light-dividing device then; Modulated behind the sets of beams process laser beam modulating device; And the modulating frequency of each light beams has nothing in common with each other, and the laser beam group after the modulation shines testing sample after via laser focusing lens, and each Shu Jiguang produces corresponding infrared radiation; Infrared radiation signal by testing sample is collected convergence by the infrared radiation gathering-device, and through getting into infrared eye behind the infrared radiation filter; The laser beam that the infrared radiation signal that infrared eye obtains contains under the different modulating frequency is induced infrared radiation signal; Represent signal respectively from different laser beam The corresponding area on the sample; These signals are handled through follow-up data, and the two-dimensional laser that obtains sample surfaces is induced the infrared radiation image.
5. a kind of multi-beam laser according to claim 4 is induced the infrared radiation formation method; It is characterized in that: described each Shu Jiguang produces corresponding infrared radiation; The infrared radiation signal of sample front surface reflection is collected by the infrared radiation gathering-device and is assembled, and through getting into the two dimensional image that infrared eye obtains testing sample behind the infrared radiation filter.
6. a kind of multi-beam laser according to claim 4 is induced the infrared radiation formation method; It is characterized in that: described each Shu Jiguang produces corresponding infrared radiation; The infrared radiation signal of surperficial outgoing is collected by the infrared radiation gathering-device and is assembled behind sample, and through getting into the two dimensional image that infrared eye obtains testing sample behind the infrared radiation filter.
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| CN103091334A (en) * | 2013-01-29 | 2013-05-08 | 合肥知常光电科技有限公司 | High-resolution detection method and device for optical surface and subsurface absorption defects |
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| CN104034704A (en) * | 2014-06-27 | 2014-09-10 | 无锡利弗莫尔仪器有限公司 | Method and device for improving infrared radiation imaging resolution ratio |
| CN109254012A (en) * | 2018-10-09 | 2019-01-22 | 中北大学 | A kind of cracks of metal surface detection device and method based on semiconductor laser |
| CN111537564A (en) * | 2020-06-16 | 2020-08-14 | 中北大学 | Metal microcrack depth detection system and method based on transmission type laser thermal imaging |
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| CN109254012A (en) * | 2018-10-09 | 2019-01-22 | 中北大学 | A kind of cracks of metal surface detection device and method based on semiconductor laser |
| CN111537564A (en) * | 2020-06-16 | 2020-08-14 | 中北大学 | Metal microcrack depth detection system and method based on transmission type laser thermal imaging |
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